CONVERTIBLE BOND PAYABLE - Summary of Convertible Bonds Payable (Details)	12 Months Ended
Dec. 31, 2021 USD ($)
Debt Instrument [Line Items]
Debt conversion amount	$ 148,841,676
2021 Series A1 Note US$ 44,000,000 1.00% due to 2026
Debt Instrument [Line Items]
Debt conversion amount	37,148,318
2021 Series A2 Note US$ 21,000,000 1.00% due to 2026
Debt Instrument [Line Items]
Debt conversion amount	21,120,487
2021 Series B Note US$ 90,000,000 1.00% due to 2026
Debt Instrument [Line Items]
Debt conversion amount	$ 90,572,871

The value of the financial instrument(s) that the original debt is being converted into in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=123431023&loc=d3e4304-108586

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=123431023&loc=d3e4332-108586

Name:	us-gaap_DebtConversionConvertedInstrumentAmount1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration